ELJ-QF3N3DF Equivalent & Substitute Parts

Part Overview

The ELJ-QF3N3DF is a 3.3 nH unshielded multilayer ceramic inductor manufactured by Panasonic Electronic Components in the 0402 (1005 Metric) surface mount package. This component is designed for high-frequency applications requiring low inductance values with a rated current capacity of 400 mA and maximum DC resistance of 120mOhm. The part is currently obsolete, making identification of suitable substitute components essential for ongoing production and design requirements.

Substiute Parts

ELJ-QF3N3DF

Panasonic Electronic ComponentsIn Stock: 1175ELJ-QF3N3DF Datasheet

Current PartRFQ

MLG1005S3N3ST000

TDK CorporationIn Stock: 35418MLG1005S3N3ST000 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELJ-QF3N3DF is determined by the following critical parameters:

• Inductance Value: Must be 3.3 nH with tolerance of ±0.3nH to maintain circuit performance
• Package Compatibility: Must be 0402 (1005 Metric) surface mount for PCB layout compatibility
• Core Material: Ceramic construction for frequency response characteristics
• Shielding Type: Unshielded configuration matching the original design
• Current Rating: Minimum 400 mA to support circuit requirements
• DC Resistance: Maximum 120mOhm to ensure acceptable power dissipation

The MLG1005S3N3ST000 from TDK Corporation meets all substitution criteria with identical inductance, tolerance, package, core material, and shielding type. The substitute part exceeds the minimum current rating requirement and maintains compatible electrical characteristics for direct replacement.

Parameter Comparison

Engineering Selection Recommendations

The MLG1005S3N3ST000 is suitable as a direct substitute for the obsolete ELJ-QF3N3DF based on the following factors:

• Product Status: The substitute part is Active, ensuring continued availability and supply chain stability
• Compliance: Both parts maintain identical REACH and ECCN classifications, supporting regulatory requirements
• Electrical Compatibility: Matching inductance and tolerance values preserve circuit design specifications
• Performance Margin: The substitute part provides higher current rating (800 mA vs 400 mA) and extended operating temperature range (-55°C ~ 125°C vs -40°C ~ 85°C), offering design flexibility
• Package Compatibility: Identical 0402 (1005 Metric) surface mount package enables direct PCB placement without layout modifications

The increased DC resistance (200mOhm Max vs 120mOhm Max) and slightly lower Q factor (8 vs 10 @ 100MHz) represent minor performance variations that remain within acceptable tolerances for most high-frequency applications using 3.3 nH inductors.

Frequently Asked Questions (FAQ)

Q: Can the MLG1005S3N3ST000 be used as a direct replacement for the ELJ-QF3N3DF?

A: Yes. Both parts share identical inductance (3.3 nH), tolerance (±0.3nH), package (0402 Metric), core material (ceramic), and shielding configuration (unshielded). The substitute part meets or exceeds all critical electrical parameters required for substitution.

Q: What are the differences in current rating between these parts?

A: The ELJ-QF3N3DF is rated for 400 mA, while the MLG1005S3N3ST000 is rated for 800 mA. The substitute part provides double the current capacity, making it suitable for applications requiring higher current handling without saturation.

Q: How do the DC resistance values compare?

A: The ELJ-QF3N3DF specifies 120mOhm Max, while the MLG1005S3N3ST000 specifies 200mOhm Max. This difference results in slightly higher power dissipation in the substitute part. For circuits sensitive to resistive losses, thermal analysis is recommended to confirm acceptable performance.

Q: Are the operating temperature ranges compatible?

A: The ELJ-QF3N3DF operates from -40°C to 85°C, while the MLG1005S3N3ST000 operates from -55°C to 125°C. The substitute part supports a wider temperature range, providing additional design margin for extreme environment applications.

Q: Is the 0402 package identical for both parts?

A: Yes. Both parts use the 0402 (1005 Metric) surface mount package with identical physical dimensions (0.039" L x 0.020" W / 1.00mm x 0.50mm) and maximum seated height (0.022" / 0.55mm). No PCB layout modifications are required.

Q: What is the significance of the Q factor difference?

A: The ELJ-QF3N3DF has Q = 10 @ 100MHz, while the MLG1005S3N3ST000 has Q = 8 @ 100MHz. This represents a minor reduction in quality factor. For high-frequency filtering or resonant applications, this difference may require circuit performance evaluation.

Q: Are moisture sensitivity levels the same?

A: Yes. Both parts are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage, handling, or reflow processes.